I am laying in bed with lilly and I just want to cry. Why does the time fly by she is about to be…

I am laying in bed with lilly and I just want to cry. Why does the time fly by she is about to be two years old she is no longer a baby that need me to every little thing for her yes she still needs me but for the most part she get her drinks and snacks out of the refrigerator herself and when i do try to help her she tells me no. I think this birthday is harder for me then her first. She is so independent and helps me so much with her sister she is so motherly and loves her sister so much.